Start weight training to build muscle. We all lose it as we age and weight
training is the only way to build and sustain it.

Exercise.  Use the muscles that are getting smaller, and they will get
bigger again.  It works at any age.  No need for bizarre dietary
supplements, but it does require work.

You have sacropenia.
Besides MSEagan's suggestion of taking
on a more deliberate program of muscle building,
in words, weight lifting, I suggest you may need
supplemental androgens. And before you do
that, get a prostate specific antigen as a screening
test for prostate cancer with can be androgen
sensitive. Understand androgens don't cause
prostate cancer (no matter what anyone says)
rather androgens can promote it growth if
it has already started.
Now that I've scared you, we will see
if you brain is still working. Androgens
aka anabolic steroids promote muscle
growth. You now need to have your
hormone levels checked. And I don't
only mean your total testosterone levels
only but also your free testosterone levels,
your DHEA levels, your estrogen levels
(as it can get too high in ratio to androgens
in older males), DHT levels, and your
prolactin levels. It suggest three books,
the first is "The Testosterone Syndrome'
by Eugene Shippen, M.D. (well respected),
"Maximize Your Vitality and Potency for
Men over 40" by Jonathan V. Wright and
Lane Lenard, Ph.D. (a bit less conventional)
and "Anabolic Therapy in Modern Medicine"
by William A. Taylor, M.D. (the book seems OK
though the author maybe retired? or he may not
have either clinical? or research experience?, so
I take him with a little salt, still his book is
based solidly on the research and is the
most scientific in style of the three books though
he is WEAK!! on specific applications).

Because you are at an age prostate cancer is
a risk, I'd be taking a larger dose of vitamin D3
( I take 4000 IU during the late fall and winter months
and 1000 IU during those months I get some sun)
as this slows the development of prostate
cancer and more surprisingly slows sacropenia.
I'd also be taking selenium and natural vitamer
tocopherol though it is late in the game for
preventatives. Still as the aged (you) are more
compromised in this handling of oxidative
stress, antioxidants may still have preventative
value as the damage is accumulating faster than
in your youth.

One aspect of sacropenia is that it is in part
caused by the death nerves supplying
the muscle with impulses. B-vitamins, vitamin E,
inositol, taurine? slow or partly reverse this loss in diabetics.
If you take diabetes as an accelerated model of aging,
one can draw the conclusion that those substances
are of use in the "normally aging" population as well.
No doubt your run-of-the mill nutritionist, or MD will
poo poo this and say this is unproven. But, I'll suggest
to you that you don't have the luxury to wait for complete
proof of concept. While it may take the "Establishment types"
another couple centuries to "discover" some of the things I've
mentioned, there are at least some practicing physicians that
use testosterone therapy in elderly males like yourself.
You will have to doctor shop and you will likely need an
endocrinologist or a doc that is into "life-extension".

There is always a new way to screw up.....................
Just don't let the "bastards" do it to you.....................
.....................................................William A. Noyes

There's an article in the Feb 2004 LEF magazine (not on their site yet)
that strongly suggests anyone taking statins should also heavily
supplement with CoQ10 to reduce the risk of muscle problems.

Drug companies have actually patented combo pills containing both a
statin and CoQ10, but so far have not produced these.